[RESOLVED] Age Verification problem

Hey everyone
I have this code:

[CODE]<script><!–

function checkAgeCheckBox(f){

var dob=new Date();
var date=dob.getDate();
var month=dob.getMonth() + 1;
var year=dob.getFullYear();

var cmbmonth=parseInt(document.getElementById(“cmbmonth”).options[document.getElementById(“cmbmonth”).selectedIndex].value);
var cmbday=parseInt(document.getElementById(“cmbday”).options[document.getElementById(“cmbday”).selectedIndex].value);
var cmbyear=parseInt(document.getElementById(“cmbyear”).options[document.getElementById(“cmbyear”).selectedIndex].value);

age=year-cmbyear;

if(cmbmonth>month){age–;}
else{if(cmbmonth==month && cmbday>=date){age–;}}

if(cmbmonth==0){alert(“You must enter the month you were born in.”);return false;}
else if(cmbday==0){alert(“You must enter the day you were born on.”);return false;}
else if(cmbyear==2007){alert(“You must enter the year you were born in.”);return false;}
else if(age<18){alert(“You are Under 18 years of age and are prohibited from entering this site!”);location.replace(“http://www.google.co.uk/”);return false;}
else if(!document.getElementById(“agree”).checked){alert(‘Check the agree box to enter this site.’);return false;}
else{return true;}

}

// –></script>[/CODE]

It seems to work perfectly in Internet explorer 6 but does not work in IE7 or Firefox, this is for a university project and I need to have it working in Firefox. I thought that I had maybe disabled the browsers javascript or something but this is not the case as I have tested it on several different computers. Can anyone help or am i better just giving up?

ps. this sounds mad but it was working perfectly in Firefox and IE7 and i just happened to go back to it one day and it has stopped functioning.

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